Lincoln Electric SVM136-A service manual Perform the SCR/Diode Bridge

Page 47

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F-7

 

 

 

 

F-7

 

TROUBLESHOOTING & REPAIR

 

 

 

TROUBLESHOOTING GUIDE

 

 

Observe Safety Guidelines

 

 

 

detailed in the beginning of this manual.

 

 

 

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

RECOMMENDED

 

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

 

 

 

The machine does not have maxi-

 

1. Make sure the correct three-

1. Check the Output Control (R4).

 

mum output.

 

phase input voltage is being

 

Normal

resistance

is 10,000

 

 

 

applied to the machine.

 

ohms.

Also check

associated

 

 

 

2. If remote control is being used,

 

wiring for loose or faulty connec-

 

 

 

 

tions. See the Wiring Diagram.

 

 

 

set the Output Control switch

 

 

 

 

 

 

 

 

 

 

 

(S2) to the “Machine or Local”

2.

Check the Output Control switch

 

 

 

position and control the weld

 

(S2) and associated wiring. See

 

 

 

output with the machine Output

 

the Wiring Diagram.

 

 

 

 

Control (R4). If the problem is

3.

Perform the Main Transformer

 

 

 

solved, check the remote control

 

 

 

 

Test.

 

 

 

 

 

unit or wire feeder and associat-

 

 

 

 

 

 

 

 

 

 

 

 

 

ed control cable.

4.

Perform the SCR/Diode Bridge

 

 

 

 

 

Rectifier Test.

 

 

 

 

 

5. The control board may be faulty.

 

 

 

 

 

Replace.

 

 

 

 

 

 

 

 

The machine will not shut off when

 

1. Make sure the three-phase input

1. Check

the input power switch

 

the power switch is put in the OFF

 

lines are connected correctly to

 

(S1) and associated leads. See

 

position.

 

the CV-400.

 

the Wiring Diagram.

 

 

 

 

 

2. Perform the Input

Contactor

 

 

 

 

 

Test.

 

 

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353.

IDEALARC CV-400

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Contents Idealarc CV-400 California Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Idealarc CV-400 InstallationLifting Safety PrecautionsLocation and Ventilation Input Supply Connections Ground ConnectionReturn to Input Wire and Fuse SizeConnect Electrode and Work Leads to Output Terminals Reconnect Procedure Output ConnectionsFigure A.5 Output Terminal Connections Connect Wire Feeders Table of Contents Operation Section Operating Instructions Safety InstructionsOperation Recommended Processes Operational Features and ControlsDesign Features General DescriptionLimitations Welding CapabilityFigure B.1 Case Front Controls Controls and SettingsLocal Control Remote ControlWelding Operation Overload Protection Auxiliary PowerIdealarc CV-400 Table of Contents Accessories Field Installed Options OPTIONS/ACCESSORIESFactory Installed Options Connecting the NA-3 to the Idealarc CV-400 Automatic Wire FeedersFeederterminal Connecting the NA-5 to the Idealarc CV-400Accessories Connecting the LN-7 to the Idealarc CV-400 Terminal Strip Semiautomatic Wire FeedersConnecting the LN-8 or LN-9 to the Idealarc CV-400 Idealarc CV-400 Table of Contents Maintenance Return to Return to Section TOC Safety Precautions Routine and Periodic MaintenanceFigure D.1 Idealarc CV-400 Table of Contents Theory of Operation Section Input Line VOLTAGE, Contactor and Main Transformer Theory of OperationOutput CONTROL, Rectification and Feedback Figure E.4 CV-400 Trigger and Thermal Light Circuit Protective Devices CircuitsFigure E.5 SCR Operation SCR OperationIdealarc CV-400 Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairElectric Shock can kill PC Board Troubleshooting ProceduresOutput Problems Troubleshooting GuideOutput Problems SCR/Diode Perform the SCR/Diode Bridge SCR/Diode Rectifier Bridge Test Welding Problems Materials Needed Control Transformer T2 Voltage TestDescription Control Transformer T2 Voltage Test Test ProcedureRight Side View Input Contactor Test Input Contactor Test Figure F.4 Input Contactor Test Connections Test for Contact ContinuityMain Transformer T1 Voltage Test Main Transformer T1 Voltage Test Figure F.6 Main Secondary Lead Test Points Blank Main Transformer T1 Voltage Test Static SCR/DIODE Rectifier Bridge Test Static SCR/DIODE Rectifier Bridge Test SCR Anode Remove ANY Insulating Paint Cathode SCR Active SCR Test Active SCR Test Figure F.15 Heat Sink Test Points Figure F.16 SCR Tester Circuit and SCR Connections Normal Open Circuit Voltage Waveform Maximum Output Setting no LoadTypical Output Voltage Waveform Machine Loaded Typical SCR Gate Voltage Waveform Maximum Output Setting no LoadONE Output SCR not Functioning Abnormal Output Voltage Waveform Machine LoadedDescription Input Contactor CR1 CLEANING/REPLACEMENTContactor Replacement Procedure Cleaning ProcedureFAN Motor and Blade Removal and Replacement Procedure FAN Motor and Blade Removal and ReplacementSCR/DIODE Rectifier Assembly Removal and Replacement Removal and Replacement SCR/DIODE Rectifier AssemblySCR Removal and Replacement SCR Removal and Replacement Figure F.21 1/2 Wide Leaf Spring Procedure for the 1/2 Inch Wide SpringClamping Procedure For 1/4-20 CAP Screws Clamping Procedure For 1/4-28 CAP ScrewsInch Wide Spring Procedure forAfter Replacing the SCRs Mounting of Stud Type Diodes To Aluminum Heat Sinks To Aluminum Heat Sinks Mounting of Stud Type DiodesMain Transformer Removal and Replacement Removal of Lift Bail Main Transformer Removal & ReplacementFigure F.26 Choke Removal Removal of Choke and TOP Iron AssemblyFigure F.27 Epoxy MIX Application Areas Reassembly of Transformer CoilsFigure F.28 Coil Lead Placement Figure F.30 Primary Thermostat Location Reassemble the Lift Bail Reassembling the Main Transformer Into the MachineWelding Output Load Test Retest After RepairInput Idle Amps and Watts Open Circuit VoltagesIdealarc CV-400 Section G Electrical DiagramsWiring Diagram Codes 10084, 10085 Wiring Diagram Code Control PC Board G2629-1 Layout Control PC Board G2629-1 Schematic Snubber Snubber PC Board M15370-3 Schematic Idealarc CV-400
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